поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

ADM1023 датащи(PDF) 7 Page - ON Semiconductor

номер детали ADM1023
подробное описание детали  ACPI?륝ompliant, High Accuracy Microprocessor System Temperature Monitor
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ADM1023 датащи(HTML) 7 Page - ON Semiconductor

Back Button ADM1023 Datasheet HTML 3Page - ON Semiconductor ADM1023 Datasheet HTML 4Page - ON Semiconductor ADM1023 Datasheet HTML 5Page - ON Semiconductor ADM1023 Datasheet HTML 6Page - ON Semiconductor ADM1023 Datasheet HTML 7Page - ON Semiconductor ADM1023 Datasheet HTML 8Page - ON Semiconductor ADM1023 Datasheet HTML 9Page - ON Semiconductor ADM1023 Datasheet HTML 10Page - ON Semiconductor ADM1023 Datasheet HTML 11Page - ON Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 16 page
background image
ADM1023
http://onsemi.com
7
Theory of Operation
Functional Description
The ADM1023 contains a two-channel analog-to-digital
converter (ADC) with special input-signal conditioning to
enable operation with remote and on-chip diode temperature
sensors. When the ADM1023 is operating normally, the
ADC operates in a free-running mode. The analog input
multiplexer alternately selects either the on-chip
temperature sensor to measure its local temperature or the
remote temperature sensor. These signals are digitized by
the ADC, and the results are stored in the local and remote
temperature value registers. Only the eight most significant
bits (MSBs) of the local temperature value are stored as an
8-bit binary word. The remote temperature value is stored as
an 11−bit binary word in two registers. The eight MSBs are
stored in the remote temperature value high byte register at
Address 0x01. The three least significant bits (LSBs) are
stored, left justified, in the remote temperature value low
byte register at Address 0x10.
Error sources such as PCB track resistance and clock noise
can introduce offset errors into measurements on the remote
channel. To achieve the specified accuracy on this channel,
these offsets must be removed, and two offset registers are
provided for this purpose at Address 0x11 and Address
0x12.
An offset value may automatically be added to or
subtracted from the measurement by writing an 11-bit, twos
complement value to Register 0x11 (high byte) and Register
0x12 (low byte, left-justified).
The offset registers default to 0 at powerup and have no
effect if nothing is written to them.
The measurement results are compared with local and
remote, high and low temperature limits, stored in six
on-chip limit registers. As with the measured value, the local
temperature limits are stored as 8-bit values and the remote
temperature limits as 11-bit values. Out-of-limit
comparisons generate flags that are stored in the status
register, and one or more out-of-limit results cause the
ALERT output to pull low.
Registers can be programmed, and the device controlled
and configured, via the serial system management bus
(SMBus). The contents of any register can also be read back
via the SMBus.
Control and configuration functions consist of:
Switching the Device between Normal Operation and
Standby Mode
Masking or Enabling the ALERT Output
Selecting the Conversion Rate
On initial powerup, the remote and local temperature
values default to −128C. The device normally powers up
converting, making a measure of local and remote
temperature. These values are then stored before making a
comparison with the stored limits. However, if the part is
powered up in standby mode (STBY pin pulled low), no new
values are written to the register before a comparison is
made. As a result, both RLOW and LLOW are tripped in the
status register, thus generating an ALERT output. This may
be cleared in one of two ways:
Change both the local and remote lower limits to
–128C and read the status register (which in turn
clears the ALERT output).
Take the part out of standby and read the status register
(which in turn clears the ALERT output). This works
only when the measured values are within the limit
values.
Figure 13. Input Signal Conditioning
C11
D+
D–
REMOTE
SENSING
TRANSISTOR
I
N y I
VDD
VOUT+
TO ADC
VOUT–
BIAS
DIODE
LOW−PASS FILTER
fC = 65kHz
1
C1 = 1000pF MAX.
IBIAS
CAPACITOR C1 IS OPTIONAL. IT IS ONLY NECESSARY IN NOISY ENVIRONMENTS.
Measurement Method
A simple method of measuring temperature is to exploit
the negative temperature coefficient of a diode, or the base
emitter voltage of a transistor, operating at constant current.
Thus, the temperature may be obtained from a direct
measurement of VBE where:
(eq. 1)
VBE + nKT
q
1n
IC
IS
This technique, however, requires calibration to nullify
the effect of the absolute value of VBE, which varies from
device to device.
The technique used in the ADM1023 is to measure the
change in VBE when the device is operated at two different
collector currents.


Аналогичный номер детали - ADM1023

производительномер деталидатащиподробное описание детали
logo
Analog Devices
ADM1023 AD-ADM1023 Datasheet
170Kb / 12P
   ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor
REV. A
logo
ON Semiconductor
ADM1023 ONSEMI-ADM1023 Datasheet
165Kb / 16P
   ACPI-Compliant, High Accuracy Microprocessor System Temperature Monitor
May, 2010 ??Rev. 9
logo
Analog Devices
ADM1023ARQ AD-ADM1023ARQ Datasheet
170Kb / 12P
   ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor
REV. A
logo
ON Semiconductor
ADM1023ARQZ ONSEMI-ADM1023ARQZ Datasheet
165Kb / 16P
   ACPI-Compliant, High Accuracy Microprocessor System Temperature Monitor
May, 2010 ??Rev. 9
ADM1023ARQZ-R7 ONSEMI-ADM1023ARQZ-R7 Datasheet
165Kb / 16P
   ACPI-Compliant, High Accuracy Microprocessor System Temperature Monitor
May, 2010 ??Rev. 9
More results

Аналогичное описание - ADM1023

производительномер деталидатащиподробное описание детали
logo
Analog Devices
ADM1023 AD-ADM1023 Datasheet
170Kb / 12P
   ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor
REV. A
logo
ON Semiconductor
ADM1023 ONSEMI-ADM1023 Datasheet
165Kb / 16P
   ACPI-Compliant, High Accuracy Microprocessor System Temperature Monitor
May, 2010 ??Rev. 9
logo
National Semiconductor ...
LM81 NSC-LM81_02 Datasheet
419Kb / 33P
   Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
LM80 NSC-LM80 Datasheet
435Kb / 29P
   Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
LM80 NSC-LM80_01 Datasheet
440Kb / 29P
   Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
logo
Texas Instruments
LM80 TI1-LM80_13 Datasheet
1Mb / 35P
[Old version datasheet]   Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
LM81 TI1-LM81_13 Datasheet
2Mb / 43P
[Old version datasheet]   Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
logo
Analog Devices
ADM1021 AD-ADM1021 Datasheet
139Kb / 12P
   Low Cost Microprocessor System Temperature Monitor
REV. 0
ADM1021A AD-ADM1021A Datasheet
203Kb / 16P
   Low-Cost Microprocessor System Temperature Monitor
REV. D
EVAL-ADM1023 AD-EVAL-ADM1023 Datasheet
292Kb / 12P
   Evaluation Board for Microprocessor System Temperature Monitor
REV. A 11/10/99
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


датащи скачать

Go To PDF Page


ссылки URL




Конфиденциальность
ALLDATASHEETRU.COM
Вашему бизинису помогли Аллдатащит?  [ DONATE ] 

Что такое Аллдатащит   |   реклама   |   контакт   |   Конфиденциальность   |   обмен ссыками   |   поиск по производителю
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com